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NewsForge: Migrating Windows to Linux--And Back--And Forth

"In October 2003, Randy Lastinger, director of network
operations for National Background Data, made himself so valuable
to the company that it had to quit using Linux. That's right. His
bosses hired Lastinger, a seasoned open source veteran, to rescue
them from the typical security woes associated with Microsoft
products. They wanted out of the closed source environment.
Lastinger fixed them up--but then the company realized that if
Lastinger went away there was no one there who could do anything
with the Linux configuration..."